From 7a1f4428831a54dd8f57d711bff6b5d6b3f6b90a Mon Sep 17 00:00:00 2001 From: Hardik Pawar Date: Wed, 16 Oct 2024 09:14:01 +0530 Subject: [PATCH 1/5] feat: Add `NextHigherSameBitCount` new algorithm with Junit tests --- .../NextHigherSameBitCount.java | 24 +++++++++++++++++++ .../NextHigherSameBitCountTest.java | 22 +++++++++++++++++ 2 files changed, 46 insertions(+) create mode 100644 src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java create mode 100644 src/test/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCountTest.java diff --git a/src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java b/src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java new file mode 100644 index 000000000000..f66e43db9683 --- /dev/null +++ b/src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java @@ -0,0 +1,24 @@ +package com.thealgorithms.bitmanipulation; + +/** + * This class provides a method to find the next higher number + * with the same number of set bits as the given number. + * + * @author Hardvan + */ +public final class NextHigherSameBitCount { + private NextHigherSameBitCount() { + } + + /** + * Finds the next higher integer with the same number of set bits. + * + * @param n the input number + * @return the next higher integer with the same set bit count + */ + public static int nextHigherSameBitCount(int n) { + int c = n & -n; + int r = n + c; + return (((r ^ n) >> 2) / c) | r; + } +} diff --git a/src/test/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCountTest.java b/src/test/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCountTest.java new file mode 100644 index 000000000000..c8fb9ef21b60 --- /dev/null +++ b/src/test/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCountTest.java @@ -0,0 +1,22 @@ +package com.thealgorithms.bitmanipulation; + +import static org.junit.jupiter.api.Assertions.assertEquals; + +import org.junit.jupiter.params.ParameterizedTest; +import org.junit.jupiter.params.provider.CsvSource; + +class NextHigherSameBitCountTest { + + @ParameterizedTest + @CsvSource({ + "5, 6", // 101 -> 110 + "7, 11", // 0111 -> 1011 + "3, 5", // 011 -> 101 + "12, 17", // 001100 -> 010001 + "15, 23" // 01111 -> 10111 + }) + void + testNextHigherSameBitCount(int input, int expected) { + assertEquals(expected, NextHigherSameBitCount.nextHigherSameBitCount(input)); + } +} From 3b1d583eff4c4457133a0bb1713a6030a61abbbd Mon Sep 17 00:00:00 2001 From: Hardvan Date: Wed, 16 Oct 2024 03:44:20 +0000 Subject: [PATCH 2/5] Update directory --- DIRECTORY.md | 2 ++ 1 file changed, 2 insertions(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index 6429757179e9..6d37f58ba9ed 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -39,6 +39,7 @@ * [IsEven](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/IsEven.java) * [IsPowerTwo](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/IsPowerTwo.java) * [LowestSetBit](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/LowestSetBit.java) + * [NextHigherSameBitCount](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java) * [NonRepeatingNumberFinder](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NonRepeatingNumberFinder.java) * [NumberAppearingOddTimes](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NumberAppearingOddTimes.java) * [NumbersDifferentSigns](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NumbersDifferentSigns.java) @@ -702,6 +703,7 @@ * [IsEvenTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/IsEvenTest.java) * [IsPowerTwoTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/IsPowerTwoTest.java) * [LowestSetBitTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/LowestSetBitTest.java) + * [NextHigherSameBitCountTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCountTest.java) * [NonRepeatingNumberFinderTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NonRepeatingNumberFinderTest.java) * [NumberAppearingOddTimesTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NumberAppearingOddTimesTest.java) * [NumbersDifferentSignsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NumbersDifferentSignsTest.java) From 43af467d28e42230d10e67e2906a01f8557c3e16 Mon Sep 17 00:00:00 2001 From: Hardik Pawar Date: Wed, 16 Oct 2024 09:18:00 +0530 Subject: [PATCH 3/5] Fix --- .../bitmanipulation/NextHigherSameBitCount.java | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java b/src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java index f66e43db9683..6a764d806279 100644 --- a/src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java +++ b/src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java @@ -12,6 +12,12 @@ private NextHigherSameBitCount() { /** * Finds the next higher integer with the same number of set bits. + * Steps: + * 1. Find {@code c}, the rightmost set bit of {@code n}. + * 2. Find {@code r}, the rightmost set bit of {@code n + c}. + * 3. Swap the bits of {@code r} and {@code n} to the right of {@code c}. + * 4. Shift the bits of {@code r} and {@code n} to the right of {@code c} to the rightmost. + * 5. Combine the results of steps 3 and 4. * * @param n the input number * @return the next higher integer with the same set bit count From 662e0db83d2fe541f7dcdfb1806ffcddfa6f27a3 Mon Sep 17 00:00:00 2001 From: Hardvan Date: Sat, 26 Oct 2024 09:40:27 +0000 Subject: [PATCH 4/5] Update directory --- DIRECTORY.md | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) diff --git a/DIRECTORY.md b/DIRECTORY.md index 90fb0faad007..395ae249198b 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -39,11 +39,8 @@ * [IsEven](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/IsEven.java) * [IsPowerTwo](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/IsPowerTwo.java) * [LowestSetBit](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/LowestSetBit.java) - - * [NextHigherSameBitCount](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java) - * [ModuloPowerOfTwo](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/ModuloPowerOfTwo.java) - + * [NextHigherSameBitCount](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCount.java) * [NonRepeatingNumberFinder](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NonRepeatingNumberFinder.java) * [NumberAppearingOddTimes](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NumberAppearingOddTimes.java) * [NumbersDifferentSigns](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/NumbersDifferentSigns.java) @@ -739,11 +736,8 @@ * [IsEvenTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/IsEvenTest.java) * [IsPowerTwoTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/IsPowerTwoTest.java) * [LowestSetBitTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/LowestSetBitTest.java) - - * [NextHigherSameBitCountTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCountTest.java) - * [ModuloPowerOfTwoTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/ModuloPowerOfTwoTest.java) - + * [NextHigherSameBitCountTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NextHigherSameBitCountTest.java) * [NonRepeatingNumberFinderTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NonRepeatingNumberFinderTest.java) * [NumberAppearingOddTimesTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NumberAppearingOddTimesTest.java) * [NumbersDifferentSignsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/NumbersDifferentSignsTest.java) From e82a732aade198a0f880ae3f248707c50c94d7ee Mon Sep 17 00:00:00 2001 From: siriak Date: Sat, 26 Oct 2024 11:57:42 +0000 Subject: [PATCH 5/5] Update directory --- DIRECTORY.md | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/DIRECTORY.md b/DIRECTORY.md index 7c866c1eed79..91082ba83a07 100644 --- a/DIRECTORY.md +++ b/DIRECTORY.md @@ -321,6 +321,8 @@ * [BresenhamLine](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/BresenhamLine.java) * [ConvexHull](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/ConvexHull.java) * [GrahamScan](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/GrahamScan.java) + * [MidpointCircle](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/MidpointCircle.java) + * [MidpointEllipse](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/MidpointEllipse.java) * [Point](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/geometry/Point.java) * graph * [StronglyConnectedComponentOptimized](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/graph/StronglyConnectedComponentOptimized.java) @@ -361,6 +363,7 @@ * [Average](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/Average.java) * [BinaryPow](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/BinaryPow.java) * [BinomialCoefficient](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/BinomialCoefficient.java) + * [CatalanNumbers](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/CatalanNumbers.java) * [Ceil](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/Ceil.java) * [ChineseRemainderTheorem](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/ChineseRemainderTheorem.java) * [CircularConvolutionFFT](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/maths/CircularConvolutionFFT.java) @@ -969,6 +972,8 @@ * [BresenhamLineTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/BresenhamLineTest.java) * [ConvexHullTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/ConvexHullTest.java) * [GrahamScanTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/GrahamScanTest.java) + * [MidpointCircleTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/MidpointCircleTest.java) + * [MidpointEllipseTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/geometry/MidpointEllipseTest.java) * graph * [StronglyConnectedComponentOptimizedTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/graph/StronglyConnectedComponentOptimizedTest.java) * greedyalgorithms @@ -1005,6 +1010,7 @@ * [AverageTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/AverageTest.java) * [BinaryPowTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/BinaryPowTest.java) * [BinomialCoefficientTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/BinomialCoefficientTest.java) + * [CatalanNumbersTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/CatalanNumbersTest.java) * [CeilTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/CeilTest.java) * [ChineseRemainderTheoremTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/ChineseRemainderTheoremTest.java) * [CollatzConjectureTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/maths/CollatzConjectureTest.java)